One vertex per element, one color per generator, with an edge from x to x·s.
(9,10)(11,15)(12,16)(13,14)(17,20)(18,22)(19,21)(23,24)(25,26,30,35)(27,36,31,32)(28,39,41,47)(29,43,46,34)(33,37,50,42)(38,48,44,51)(40,56,45,55)(49,54,52,53)(1,2)(3,7)(4,6)(5,8)(10,14)(12,19)(15,20)(18,23)(25,27,30,31)(26,32,35,36)(28,37,41,42)(29,44,46,38)(33,47,50,39)(34,51,43,48)(40,54,45,53)(49,55,52,56)(1,3)(2,5)(4,8)(6,7)(9,11)(10,15)(12,18)(13,17)(14,20)(16,22)(19,23)(21,24)(25,28,27,37,30,41,31,42)(26,33,32,47,35,50,36,39)(29,45,38,54,46,40,44,53)(34,52,48,55,43,49,51,56)(3,8)(5,7)(10,14)(11,17)(16,21)(18,23)(25,29)(26,34)(27,38)(28,40)(30,46)(31,44)(32,48)(33,49)(35,43)(36,51)(37,53)(39,55)(41,45)(42,54)(47,56)(50,52) involution — undirected(2,6)(5,7)(9,12,13,19)(10,16,14,21)(11,18,17,23)(15,22,20,24)(29,46)(34,43)(38,44)(40,45)(48,51)(49,52)(53,54)(55,56)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.